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Hi Rachel,
The new W3C Web Animation API will give developers cool new features such as media synchronization so you won’t have to use nasty JS timers hacks.

Another way to create a parallax effect would be to use a translateZ() transform to arrange your layers on the Z axis and animate the perspective origin. You will get a “true” parallax since this is created on a real 3D model, no more guess work and approximation.